Well casing scraping and polishing tool



June 10, 1958 W; E. COYLE WELL CASINGSCRAPING AND POLISHING TOOL Filed Oct. 14, 1953 INVENTOR. WILUAM E COYLE ATToQMEY United States Patent WELL CASING SCRAPING AND POLISHING TOOL William E. Coyle, Cotton Valley, La.

Application October 14, 1953, Serial No. 385,954

3 Claims. (Cl. 166173) This invention relates to a well casing scraping and polishing tool and has for its primary object to dislodge deposits of undesirable substances from the walls of a well casing and to polish the surfaces of such walls to remove any rough spots upon which substances might cling.

Another object is to facilitate the introduction of the tool into the well casing and at the same time assure adequate contact of the working surfaces of the tool with the well casing. Y

A further object is to so simplify the construction and assembly of the tool that it can be readily produced with but a minimum of labor and expense.

A stillfurther object of the invention is the provision of a tool for drill pipe having a tubular head that comprises an upper unit and a lower unit, spiral scrapers carried by the upper unit and projecting outwardly therefrom for engaging the wall of a well casing and scraping it as the drill pipe is lowered down in the casing or rotated during its downward movement during a drilling operation, hones and scrapers carried by the lower unit and extending outwardly therefrom,- the scrapers engaging the well-casing and scraping it, the hones polishing the wall of the well casing.

A still further object of the invention is the provision of a tool having means for engagement with a well drilling tool. a

In the drawing:

Figure 1 is a fragmentary vertical sectional view through a well casing showing this improved scraping and polishing tool in place therein,

Figure 2 is a longitudinal sectional view taken substantially on the line 22 of Figure 1,

Figure 3 is a horizontal sectional view taken substantially on the line 3 -3 of Figure 1, and

' Figure 4 is a 'horiiontal" sectional view taken substantially on the line 4-4 of Figure 1.

Referring to the drawing in detail, a well casing C is shown in section and it is adapted to receive a drill pipe P, the socket S of the drill pipe normally receiving a drilling tool T shown in dotted lines.

'Intermediate the drilling tool T and the pipe string P, I introduce the head of my scraping and honing tool which head comprises a scraping unit 10 and a honing and scraping unit 12.

The scraping unit 10 comprises a body 14 of circular cross section having an axial bore 16 extending therethrough and helical grooves 18 which extend through its periphery. Opposite ends of the body 14 are reduced in diameter to define longitudinally projecting extensions 20 which are externally screw threaded as will be readily understood upon reference to Figure 2. Formed in the body 14 and opening through the bottoms of the grooves 18 substantially midway between opposite ends of the body 14 are recesses 22 in which coiled compression springs 24 are seated, and fitting into the helical grooves 18 are helical scraper blades 26 which are engaged by the coiled compression springs 24 and yieldingly urged outwardly thereby. Carried by the scraper blades 26 and extending longitudinally therefrom adjacent the extensions 20 are retaining ears 28 which are adapted to extendinto annular recesses 30 formed in scraper retaining caps 32 which threadedly engage the extensions .20. It will thus be seen that the scraper blades 26 will be held in the grooves 18 by the caps 32 and against the coiled compression springs 24 in such a manner that they may rock longitudinally in the grooves and at the same time will be yieldingly urged outwardly thereof. Each cap is pro vided with an axial opening 34 which aligns with the axial bore 16 and carried by each cap and extending longitudinally therefrom is an externally screw threaded nipple 36 which is adapted to fit the socket S of the drill pipe P and a socket in the hone 12.

The scraper blades 26 are provided on their outer surfaces with integrally formed ridges 38 having a sharpened edge and are relieved as at 40 so that matter scraped from the casing C will not accumulate between the easing C and blades 38 to interfere with the functionthereof. 4

The hone designated generally 12 comprises a body 42 having an axial bore 44 extending therethrough. The body 42 is provided adjacent opposite ends with internally screw threaded sockets 46 and 48 which are Seated in diametrically opposed grooves 50in the body 42 of unit 12 are hones 54 having convex abrasive faces 56 which are adapted to engage the wall of the well casing C to polish it. The hones are provided adjacent the ends adjacent the socket 48 with elongated slots 58 inwhich the pins 52 are received to retain in place the ends of the hones adjacent the socket 48. The abrasive faces 56 of the hones are convex as shown and extending longitudinally from the hones adjacent the ends thereof remote from the slots 58 are tongues 60. Entering the hones 54 through the surfaces thereof adjacent the bottoms of the grooves 50 and near the tongues 60 are recesses 62 in which are seated compression coiled compres-' sion springs 64 which yieldingly urge the bones outwardly and-the abrasive faces 56 into contact with the wall of the well casing C. v

Seated in the grooves 50 between those containing the hones 54 are scraperhblades '66 having convex scraping faces 68. The ends of the blades 66 adjacent the socket 48 are fastened in the grooves 50 in a manner similar to the hones 54 and carried by the blades 66 and extend ing longitudinally from the ends thereof remote from the socket 48 are tongues 70. Suitable keepers 72 are screwed to the body 42 and overlie the tongues 60 and 70 to hold the ends of the hones 54 and blades 66 in their respective grooves 50. Like the hones 54, the blades 66 are recessed as at 74 to receive compression coiled springs 76 by which the convex faces of the blades 66 are urged into contact with the well casing.

In use as the drill pipe P is lowered and rotated within the well casing the tool will be moved in like manner. The drilling mud which is pumped downwardly through the drill pipe and bores 34, 1-6 and 44 enters the well hole through the tool T and then flows upwardly around the exterior of the drilling tool, the scraping tooland drill pipe and carries with it the cuttings and like debris. During the drilling operation, the surface of the well casing is scraped by the spiral scrapers 26 and by the rotary motion of the drill pipe the greater portion of the Patented June 10, 1958' 3 area of the casing that is engaged by the spiral scrapers will be engaged by the honest) as to produce a smooth surface within the well casing to which foreign matter will not cling.

While in the foregoing there has been-shown and do scribed the preferred embodiment of this invention, it is to. be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What is claimed is:

1. A Well casing scraping and polishing tool comprising a. core having a passage extending longitudinally therethrough, external screw threads carried by the core adjacent opposite ends thereof, said core having spiral grooves opening through its periphery, spiral scraper blades mounted in said grooves for radial movement relative to the core, said spiral scrapers being in uniform relation to each other throughout their length, lugs carried by the scraper blades and extending longitudinally therefrom adjacent opposite threaded ends of the core, caps threadedly engaging the threads at opposite ends of the core and having aligned openings extending there through which register with the passage through the core, externally screw threaded nipples carried by the caps and extending longitudinally outwardly therefrom, flanges carried by the caps and extending longitudinally there from adjacent the ends thereof remote from the nipples to engage the lugs and retain the scraper blades in their grooves, and springs mounted in the core and engaging the scraper blades midway between opposite ends thereof to yieldingly support the blades for rocking movement Of the core.

2. A scraping and honing tool for scraping and honing the wall of a well casing as it is moved by a string of drill pipe, said scraping and honing tool comprising a tubular body having elongated longitudinal grooves opening through its periphery, elongated scraper blades mounted in alternate grooves to move in radially disposed arcuate paths, the outer faces of said scraper blades being convex, elongated hones mounted in the intermediate grooves. for movement in radially disposed arcuate paths, the outer faces of said hones being convex and carrying abrasive, said scraper blades and bones having transverse slots extending therethrough adjacent selected ends thereof, pins carried by the tubular body and extending through the slots to pivotally and slidably support the selected ends of the scrapers and, hones in the grooves, fingers carried by the hones and by the blades and extending therefrom adjacent the ends thereof remote from the slots, springs carried by the body and engaging the b a es. and hones adjacent'the ends thereof remote from the slots for yieldingly urging the blades and the bones outwardly relative to the tubular body, and retainers removably carried by the body and extending into the ,4 grooves for engaging the fingers and holding said blades and hones in the grooves.

3. A scraping and honing tool comprising an upper unit and a lower unit, the upper unit having a core having a passage extending longitudinally therethrough, external screw threads carried by the core adjacent opposite ends thereof, said core having spiral grooves opening through its periphery, spiral scraper blades mounted in said grooves in spaced relation throughout their length, a ridge on the outer face of said spiral scraper blades, said ridge having a sharpened edge for engagement with the wall of a well casing, caps threadedly engaging the threads at opposite ends of the core and having aligned opening extending therethr-ough which register with the passage through the core, externally screw threaded nipples on said caps, flanges carried by the caps to engage lugs on the scraper blades to retain the scraper blades in their grooves, resilient means mounted in the core and engaging the scraper blades midway their ends to yieldingly urge the blades to the wall of a well casing, the lower unit having a passage extending longitudinally therethrough and in register with the passage in said core, right angular grooves, elongated scraper blades mounted in altcrnate grooves to move in radially disposed arcuate paths, the outer faces of the elongated scraper blades being convex, elongated hones mounted in the intermediate grooves for movement in radially disposed arcuate paths, the outer faces of said hones being convex and carrying abrasive, said scraper blades and hones having transverse slots extending therethrough adjacent selected ends thereof, pins carried by the tubular body and extending through the slots to pivotally and slidably support the selected ends of the scrapers and bones in the grooves, fingers carried by the hones and by the blades and extending therefrom adjacent the ends thereof remote from the slots, springs carried by the body and engaging the blades and hones adjacent the ends remote from the slots for yieldingly urging the blades and bones outwardly relative to the tubular body, and retainers removably carried by the body and extending into the grooves for en-v gaging the fingers and holding said blades and bones in the grooves.

References Cited in the file of this patent UNITED STATES PATENTS 1,484,353 Kidwell Feb. 19, 1924 1,839,771 Packer Jan. 5, 1932 2,275,939 Baker Mar. 10, 1942 2,334,788 OLeary Nov. 23, 1943 2,443,941 Wilkerson June 22, 1948 2,667,930 Saurenman et a1. Feb. 2, 1954 2,670,046 Kingz'bach Feb. 23, 1954 2,695,673 Coyle Nov. 30, 1954 

